Improvement in check-valves for oil-pumps



A. M. TERRILL. v CHECK-VALVE FOR OIL-PUMPS.

PatentedAug. 28,1877.

' ATTORNEYS.

UNITED STATES PATENT OEEIoE.

AMOS M. TERRILL, OF PETROLIA, PENNSYLVANIA.

IMPROVEMENT IN CHECK-VALVES FOR OIL-PUMPS.

Specification forming part of Letters Patent No. [94,627, dated August 28, 1877; application filed July 30, 1877.

To all whom it may concern Be it known that I, AMOS M. TERRILL, of Petrolia, in the county of Butler and Slate of Pennsylvania, have invented a new and Improved Gheek-Valve for Oil-Pumps, of which the following is a specification:

The object of my invention is to provide a check -'valve for attachment to the workingbarrels of oil-pumps that will retain the fluid and relieve the piston from the column of fluid contained by the well.

In the drawing, which is a central vertical section, A is a tapering sleeve, which is coated with soft metal, and fitted to the upper end of the workingbarrel of an oil-pump, and provided with concave valve-seat, to which is fitted a valve, B, having 'a tubular stem, 0, which is drilled transversely immediately under the face of the valve. The tubular stem 0 is provided with a collar, D, which limits the lift of the valve. The bore of the valve is smaller than that of the tubular stem, and it is fitted to the piston-rod E. (Shown in dotted lines.) As the piston rises the upward pressure of the liquid lifts the valve, and the liquid escapes through the apertures under the valveface to the tubing of the well. When the piston descends the valve closes, and prevents the return of the liquid to the pump'barrel.

Having thus described myinvention, I claim as new and desire to secure by Letters Patentv The tapering sleeve A and the valve B, having the tubular stem 0, provided with dis charge-apertures, combined and adapted for use in connection with the workingbarrel and piston of an oil-well pump, substantially as shown and described.

AMOS MORIS TERRILL. Witnesses:

PERRY THAYER, S. W. HARLEY. 

